/* The ground everything stands on: the reset, the media elements nobody
 * sees, the browser surfaces (scrollbar, selection, caret, focus), and
 * the shared control vocabulary (buttons, fields, switches, sliders). */

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--dome-deep);
  color: var(--star);
  font: var(--t-body);
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
  cursor: default;
}

/* -- browser surfaces carry the design too ------------------------- */

::selection { background: rgba(240, 181, 107, 0.30); color: var(--star); }
input, textarea { caret-color: var(--lamp); }

* {
  scrollbar-width: thin;
  scrollbar-color: var(--seat-2) transparent;
}
*::-webkit-scrollbar { width: 8px; height: 8px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb { background: var(--seat-2); border-radius: var(--r-round); }
*::-webkit-scrollbar-thumb:hover { background: var(--dusk); }

:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--lamp);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

/* The controls below set display, which would beat the UA's [hidden]
   rule; app.js hides things by the attribute, so it must always win. */
[hidden] { display: none !important; }

h1, h2, h3, p { margin: 0; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
button:disabled { cursor: default; opacity: 0.5; }

svg.icon {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: none;
  display: block;
}

/* -- the picture --------------------------------------------------- */

#view {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* The source frames go to a texture, never to the screen.  Kept inside the
   viewport and never display:none -- Chrome stops decoding a video it thinks
   nobody is looking at, and a stalled decoder means a black sphere. */
#video, #cam {
  position: fixed;
  left: 0;
  top: 0;
  width: 1px;
  height: 1px;
  opacity: 0.01;
  pointer-events: none;
  z-index: -1;
}

/* youtube's iframe, where the sphere would be.  #surface (player.css)
   lies over it; embed.js lays the iframe out oversized and scales it down. */
#embed {
  position: fixed;
  inset: 0;
  display: none;
  background: var(--dome-deep);
}

body.embedded #embed { display: block; }
body.embedded #view { display: none; }

#embed iframe { border: 0; display: block; }

/* -- shared controls ----------------------------------------------- */

.btn, .btn-primary, .btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  height: var(--control);
  padding: 0 var(--s-4);
  border: 1px solid var(--rail);
  border-radius: var(--r-sm);
  background: var(--seat);
  color: var(--star);
  font: var(--t-title);
  white-space: nowrap;
  transition: background var(--t-base) var(--ease-out), border-color var(--t-base) var(--ease-out),
              color var(--t-base) var(--ease-out), transform var(--t-fast) var(--ease-out);
}

.btn:hover, .btn-icon:hover { background: var(--seat-2); border-color: var(--rail-strong); }
.btn:active, .btn-icon:active, .btn-primary:active { transform: translateY(1px); }

.btn-icon {
  width: var(--control);
  padding: 0;
  color: var(--star-dim);
}
.btn-icon:hover { color: var(--star); }

.btn-primary {
  background: var(--lamp);
  border-color: transparent;
  color: var(--dome-deep);
  padding: 0 var(--s-6);
  font-weight: 600;
}
.btn-primary:hover { background: var(--lamp-deep); }

/* A field: seat ground, one hairline, the lamp only when focused. */
input[type="search"], input[type="text"], select {
  height: var(--control);
  padding: 0 var(--s-3);
  border: 1px solid var(--rail);
  border-radius: var(--r-sm);
  background: var(--seat);
  color: var(--star);
  font: var(--t-title);
  transition: border-color var(--t-base) var(--ease-out), background var(--t-base) var(--ease-out);
}
input[type="search"]::placeholder { color: var(--star-dim); }
input[type="search"]:focus, input[type="text"]:focus, select:focus {
  border-color: var(--lamp-rim);
  background: var(--seat-2);
}
input[type="search"]:focus-visible, select:focus-visible { outline: none; }
input[type="search"]::-webkit-search-cancel-button { -webkit-appearance: none; appearance: none; }

select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: var(--s-8);
  width: 100%;
}
.select-wrap { position: relative; display: block; }
.select-wrap .icon {
  position: absolute;
  right: var(--s-3);
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--star-dim);
  pointer-events: none;
}

/* A slider: a brass track, the played part in lamp, a lamp thumb. */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 24px;
  margin: 0;
  background: transparent;
  cursor: pointer;
  --fill: 0%;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  border-radius: var(--r-round);
  background: linear-gradient(90deg, var(--lamp) var(--fill), var(--brass-dim) var(--fill));
}
input[type="range"]::-moz-range-track {
  height: 2px;
  border-radius: var(--r-round);
  background: var(--brass-dim);
}
input[type="range"]::-moz-range-progress { height: 2px; background: var(--lamp); }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  margin-top: -7px;
  border-radius: 50%;
  background: var(--lamp);
  border: 2px solid var(--dome-deep);
  box-shadow: 0 0 0 1px var(--brass-dim);
  transition: transform var(--t-fast) var(--ease-out);
}
input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--lamp);
  border: 2px solid var(--dome-deep);
  box-shadow: 0 0 0 1px var(--brass-dim);
}
input[type="range"]:hover::-webkit-slider-thumb, input[type="range"]:focus-visible::-webkit-slider-thumb { transform: scale(1.15); }
input[type="range"]:focus-visible { outline: none; }
input[type="range"]:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 3px var(--lamp-rim); }

/* A switch: a checkbox drawn as a 34×20 track with a knob. */
input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 34px;
  height: 20px;
  margin: 0;
  flex: none;
  border-radius: var(--r-round);
  background: var(--seat-2);
  border: 1px solid var(--rail);
  position: relative;
  cursor: pointer;
  transition: background var(--t-base) var(--ease-out), border-color var(--t-base) var(--ease-out);
}
input[type="checkbox"]::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--star-dim);
  transition: transform var(--t-base) var(--ease-out), background var(--t-base) var(--ease-out);
}
input[type="checkbox"]:checked { background: var(--lamp); border-color: var(--lamp); }
input[type="checkbox"]:checked::after { background: var(--dome-deep); transform: translateX(14px); }
input[type="checkbox"]:focus-visible { outline-offset: 3px; border-radius: var(--r-round); }

kbd {
  font: var(--t-label);
  letter-spacing: var(--track-label);
  color: var(--brass);
  border: 1px solid var(--brass-dim);
  border-radius: var(--r-xs);
  padding: 1px 5px;
  min-width: 18px;
  display: inline-block;
  text-align: center;
}

/* -- the toast: one message at a time, above everything but a drop ---- */

#toast {
  position: fixed;
  bottom: 128px;
  left: 50%;
  z-index: 50;
  max-width: min(40ch, calc(100vw - 2 * var(--gutter)));
  width: max-content;
  transform: translateX(-50%) translateY(6px);
  padding: var(--s-2) var(--s-4);
  /* A pill on one line; a softly rounded box when it has to wrap. */
  border-radius: calc(var(--control) / 2);
  background: var(--seat);
  border: 1px solid var(--rail);
  color: var(--star);
  font: var(--t-title);
  text-align: center;
  text-wrap: balance;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-slow) var(--ease-out), transform var(--t-slow) var(--ease-out);
}
#toast.on { opacity: 1; transform: translateX(-50%) translateY(0); }
/* In the library there is no bottom bar to clear. */
body.browsing #toast { bottom: var(--s-8); }

/* -- only raised while a file is genuinely over the window --------- */

#dropzone {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: none;
  place-items: center;
  background: rgba(6, 8, 20, 0.86);
}
body.dropping #dropzone { display: grid; }
#dropzone span {
  font: var(--t-headline);
  color: var(--lamp);
  border: 1px dashed var(--lamp-rim);
  border-radius: var(--r-lg);
  padding: var(--s-12) var(--s-16);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}